Which of the following is an open statement?

For the statements $p$ and $q$,consider the following compound statements :
$(a)$ $(\sim q \wedge (p$ $\rightarrow q))$ $\rightarrow \sim p$
$(b)$ $((p \vee q) \wedge \sim p) \rightarrow q$
Then which of the following statements is correct?

Consider the following statements:
$p$: If voltage increases, then current decreases.
$q$: If voltage does not increase, then current does not decrease.
$r$: If current decreases, then voltage increases.
$s$: If current does not decrease, then voltage does not increase.
Which of the following pairs of statements have the same meaning?

For each of the following compound statements,first identify the connecting words and then break it into component statements.
Square of an integer is positive or negative.

The statement pattern $p$ $\rightarrow (q$ $\rightarrow p)$ is equivalent to

Which of the following statements is logically equivalent to $\sim (p \leftrightarrow q)$?